1-Methylimidazole → Phenylmethyl (3S)-3-{[(6-chloro-2-pyridinyl)amino]carbonyl}-2-[(2R)-3-cyclopentyl-2-({formyl[(phenylmethyl)oxy]amino}methyl)propanoyl]-1-pyrazolidinecarboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-[(2R)-3-cyclopentyl-2-({formyl[(phenylmethyl)oxy]amino}methyl)propanoyl]-1-{[(phenylmethyl)oxy]carbonyl}-3-pyrazolidine carboxylic acid (as a mixture of diastereomers enriched in (3S)-2-[(2R)-3-cyclopentyl-2-({formyl[(phenylmethyl)oxy]amino}methyl)propanoyl]-1-{[(phenylmethyl)oxy]carbonyl}-3-pyrazolidinecarboxylic acid) (300 mg, 0.558 mmol) in dichloromethane (5 ml) was added 1-methylimidazole (133 μl, 1.674 mmol) and cooled to 0° C. Mesyl chloride (56 μL, 0.725 mmol) was added dropwise at 0° C. and stirred for 1 hr at rt. The mixture was then treated with 2-amino-6-chloropyridine (86 mg, 0.67 mmol). The solvent mixture was removed. The residue was diluted with MeOH and purified by reverse-phase HPLC to afford 268 mg (0.413 mmol, 74%) of the title compound. LC/MS: (M+H)+: 648.3.

Provenance & Evidence